The act or habit of making statements based on pride, self-importance, conceit, or the assumption of intellectual superiority and the presumption of knowledge that is not in evidence or supported by any facts or experience.

"The War in Iraq is similar to the War in Vietnam" stated by Howard Dean is based on Dr. Dean's arrogance and self-importance, and not based on any understanding of current events or direct knowledge of the situation in Iraq.

Senator Kennedy repeating "Lie after Lie after Lie..." is evidence of his arrogance that seems to derive from little more than his family name, and not from his knowledge of the subject matter, or his understanding of events.

Contrast this to ignorance -- for example, claiming that Islam is a Peaceful Religion when in fact the religion is only peaceful to others who submit to it (the meaning of "Islam") and even then it is not peaceful to other "believers" who belong to different Islamic sects. This is not an example of arrogance as much as an example of ignorance, but the act of making such claims is similar to arrogance.

You then sit around a table in a large group. The first person must pour an amount of alcohol into a glass, depending on how confident they are that they can predict the outcome of the coin toss and how much they can drink they pour more or less into the glass, hence the name of the game. They must then toss a coin and call heads or tails, if they are correct then the glass is passed to the next person. If they call wrong they have to down the contents of the glass.

Tom: 'I can predict the outcome of a coin toss every time'
Chris: 'Really, you should be good at Arrogance then'
Tom: 'I'm good at everything, me'
Chris: 'Cool'
Tom: 'Right, *pours half litre of vodka into pint glass*, tails never fails, I predict it will be tails' *tosses coin*